Process Equipment and Plant Design
Ponchon Savarit method is based on the use of enthalpy concentration diagram, which contains the bubble point curve (saturated liquid curve), dew point curve (saturated vapour curve) and equilibrium tie lines. As compared to McCabe-Thiele's method, this method

Facilitates direct calculation of heat load on reboiler & condenser from, the diagram used in this method
Accounts for the enthalpy changes in the process
All of these
Is more accurate in finding the number of equilibrium stages

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Process Equipment and Plant Design
The LMTD correction factor (FT) is defined as the

Ratio of true temperature difference to the LMTD
Geometric mean of the true temperature difference and the LMTD
Ratio of LMTD to the true temperature difference
Differenced of true temperature difference and the LMTD

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